Air-compressor.



No. 739,792. P'TENTED SEPT. 22, 1903.

L. i ART AIR PRB L I i.; Wvg

No. 799,799. PATENTED SEPT. 2z, 1999.V

L. M. SARTAIN.

AIR COMPRESSOR.

APPLICATION FILED APE. 27. 1803.

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Patented September 22, 1903.

LOUIS MARTAIN SARTAIN,

WILLIAM I. STONE,

OF TRACY CITY,TENNESSEE, ASSIGNOR TO OF TRACY CITY, TENNESSEE.

AIR-COMPRESSOR.

PCIICTION forming part of Letters 'Patent No. 739,792, dated September 22, 1903.

Application iled April 2.7. 14903. Serial No. 154,483. (No model.)

To all whom it may oon/cern:-

Be it known that 1, Louis MARTAIN SAR- TAIN, a citizen of the United States, residing at Tracy City, in the county of Grundy and State of Tennessee, have invented a new and useful Air-Compressor, of which the following is a specification.

This invention relates to air-compressors, and more particularly to that type of air-compressors in which intermeshing toothed rolls rotate in a space in which they it air-tight and force the air into a chamber, from which it may be withdrawn through suitable exhaust-pipes. l

The object of the invention is to provide an improved air-compressor of the type above specified in which the operation will be continuous in drawing in air through a plurality of inlet-ports and in which thc elements are so formed and arranged that a mechanism of efficiency and durability in service is obtained.

In accomplishing the object above stated I make use of the mechanism shown in preferred form in the accompanying drawings, forming a part of this specification, in which corresponding parts are designated by the same characters of reference throughout the various views, it being understood that changes in the form, proportions, and exact mode of assemblage of the elements therein exhibited may be made without departing from the spirit of the invention or sacricing any of its advantages.

In the drawings, Figure 1 is a view of the compressor in side elevation. Fig. 2 is a longitudinal vertical section. Fig. 3 is a transverse vertical section. Fig. Il is a View in perspective of one member of the casing.

Referring to the drawings by reference characters, 1 designates the base of the machine, which may be bolted to any suitable framework and which comprises the bed-v plate 2 and the end blocks 3 3, which may be of any desired form, but which are preferably of the form shown, with the projecting lugs l provided at the edges of the inwardly-disposed faces in order. to form means for retaining the casing 5 in position. The casing .5 may be of any desired ,externalconiiguration, but is preferably formed, as shown, in

`ments suitably fastened together.

two sections 6 6, each of which consists of a body portion 7 and a horizontally-disposed plate 8' at either end thereof. The plates 8 extend over the blocks 3 and are provided with holes 9 for the insertion of bolts 10, which extend downward through the end plates of both sections of the casing into the end blocks in order to hold them fast upon the base of the machine. In each side wall of the casing there is a centrally-placed circular opening 11, which communicates with the interior thereof and permits the extension through the sides of the casing of a shaft 12, which is journaled in bearing-blocks 13. The bearing-blocks 13 are located outside of the casing and have the ends thereof secured in position upon the blocks 3 by means of bolts 14.

In the interior of the casing there is a chamber 15 of substantially circular cross-section in a plane at right angles to the axis of the shaft 12. The chamber is preferably formed with an annular shoulder 16 at either side thereof projecting inwardly from the wall of the chamber, as shown, and about midway between the shoulders 16 there is provided, on the curved outer wall of the chamber, a rackl, which extends entirely around the chamber.

Rigidly mounted upon the shaft 12 is a rotary carrier 18, which may be formed integral or built up of a plurality of separate ele- The carrier 1S comprises two disk-like portions 19, one of which lies in contact with each side wall of the chamber 15 and has on the outer surface thereof an annular rabbet 20, corresponding to the annular shoulder 16, provided on the chamber-wall. is so proportioned that the annular shoulders 16 on the walls of the chamber 15 and the annular rabbets 20 on the rotary carrier lit air-tight for a purpose that will hereinafter be explained. The two disk-like portions 19 are spaced apart at their peripheries, leaving an opening between them for the location of the intermeshing rolls referred to in a preceding paragraph, and lying between the disk-like portions and surrounding shaft 12 is the irregularly-shaped portion of the carrier,(designated 21,) the periphery of which is composed of the concavities 22 and the con- The carrier 18 A IOO ` direction opposite to `In the carrier illustrated in the drawings `tween the teeth will be discharged into the vexities 23. The concavitiesV 22 are arranged in pairs, each pair being separated from the adjacent pairs by the convex portions 23.A

there are shown three pairs of concavities 22 and three con veXities 23, separating` the pairs of concavities as already explained. It is, however, obvious that the number of concavities and convexities may be increased, but the relation already described must beA preserved. The concavities 22 form seats for the pairs of intermeshing toothed rolls 24 25, which are supported on'aXles 26 27, mountedl in the disk-like portions 19 of the rotary carrier. The concavities 22 are so formed that the rolls 24 25 make air-tight contact there- With and with each other when mounted upon the axles provided for them. The rolls 24 25 also fit air-tight between the disk-.like portions 19 of the rotary carrier, and when rotated in the direction indicated by the arrows they draw air inward through inlet-ports 28, provided in the concavities 22 and communicating with openings 29 in one of the disklike portions 19. The ports 28 are shown as six in number, one port being provided for each of the concavities 22. The openings 29, however, are only three in number, each of said openings 29 communicating with two of the ports 28, so that each pair of intermeshing rolls 24 25 serves to draw air through one of the openings 29.

It will be observed that the axles 26 27, upon which rolls 24 and 25 are journaled, respectively, are not at the same distance from the periphery of the carrier 18. Instead the axles 26, upon which rolls 24 are mounted, lie nearer to the periphery of the carrier and at such distance from the periphery that rolls 24 are always in mesh with the rack 17, provided on the outer wall of the chamber v15, while rolls 25 are Wholly between the disk-like portions 19 of the carrier and never come in contact with the rack 17. Owing to the arrangement just described, when the carrier 18 is caused to rotate with the shaft 12, as by means of a belt 31, driven by any suitable motor, and

pulley 32, provided on one end of shaft 12, the rolls 24 will be continuously driven in the same direction by means of their engagement with the rack 17 on the outer wall of the chamber 15 and rolls 25 will be driven in the that of rolls 24 by said rolls 24, with which they are in mesh. The rolls 24 and 25 are, as already stated, in airtight contact with the inner surfaces of the disk-like portions 19 of the carrier, with the concavities 22 formed on the periphery ofthe irregularly-shaped central portion, and with each other. Consequently when the rotary carrier is set in motion in the direction indicated by the arrows on the drawings the rolls passing over the members 28 in the concavities 22 will carry air with them in the'space between the teeth, and as the teeth pass out of contact with the concavities 22 the air bespace over the convex surfaces 23. Air cannot pass backward between the rolls into the concavities 22, forA the reason that the rolls 24 25 form an air-tight joint where their teeth intermesh. It will therefore be readily seen that as long as the carrier 18 is caused to rotate air will be continuously drawn through each of the intake-openings 29 and discharged over the convex surfaces 23 into the space lying between the outer wall of the chamber 15 and the rotary carrier, from which it can escape only through the outlet-pipe 33, provided for that purpose.

In order to insure the proper contact of the toothed rolls 24 and 25 with the concavities 22, with the disk-like portions 19.0f the carrier, and with each other, packing devices of any preferred kform may be used, if desired;

but as such packing devices are not essential to the operation of my'compressor and donot form a part of the invention I have not shown or described any ments mentioned. It is obvious that packing devices may also be employed to insure air-tight contact of the shoulders 17 with the rabbets 20; but the packing devices are not essential in securingair-tight contact between these structures any more than in those already referred to, and consequently the same reasons for not showing or describing packing` devices therefor would apply.

It will be seen that the compressor as described and illustrated in the accompanying drawings is of compact construction, with but a small number of parts, and with no delicate adjustments. The construction is such that a high rate of speed may be maintained without in any way deranging the apparatus, and one of the principal objects contemplated in the invention is to provide an apparatus that is susceptible of being driven continuously at a high rate of speed without being liable to derangementL thereby.

Having thus described the construction and operation of my invention, what I claim as new, and desire to secure by LettersPatent, is`

1. The combination in apparatus of the class described of a casing, a rotary carrier journaled for rotation within said casing and adapted to lie in air-tight contact with the side walls of said casing, a plurality of pairs of intermeshing toothed rolls rotatably mounted on said carrier in air-tight contact with concave seats having inlet-ports therein provided on said carrier, and means for rotating said carrier and said intermeshing toothed rolls'.

2. The combination in apparatus of the class described of a casing, a circular rack provided in said casing, a carrier mounted for rotation within said casing and adapted to lie in air-tight contact with the side walls of said casing, a plurality of pairs of intermeshing toothed rolls rotatably mounted on said carrier and making air-tight contact with concave seats having inlet-ports provided on said carrier, one member of each pair of intermeshform of packing for the ele-- IOO IIO

ing rolls being in engagement with said rack, and means for rotating said carrier.

3. The combination in apparatus of the class described of a casing having a chamber with outer curved and lat side walls, a carrior mounted for rotation in said chamber, said carrier comprising an irregularly-shaped central portion and a pair of disk-like portions between which said central portion lies, a plurality of pairsof intermeshng toothed rolls rotatably mounted between said disklike portions and in air-tight contact with concave seats having inlet-ports provided on said central portion and with the inner surfaces of said disk-like portions, and means for imparting rotation to said carrier and to said intermeshing toothed rolls.

4c. The combination in apparatus of the class described of acasing having a chamber of substantially circular outline, an annular shoulder provided on each side of said chamber and projecting thereinto, a rotary carrier mounted for rotation in said casing and comprising a pair of disk-like portionsY spaced apart and having on the outer surface of each anannnlar rabbet adapted to form an airtight joint with one of said shoulders and a central portion between said disk-like portions provided on its periphery with a plurality of pairs of concavities each having an inlet-port, a plurality o'f pairs of intermeshing toothed rolls rotatably mounted between said disk-like portions and in air-tight contact with the inner walls of said disk-like portions and with the concavities in the periphery of said central portion, and means for imparting rotation to said carrier and to said intermeshing toothed rolls.

5. The combination in apparatus of the class described of a casing having a chamber of circular outline, a circular rackon the outer wall of said chamber, a. rotary carrier mounted for rotation within said chamber and lying in air-tight contact with the side walls of said chamber, a plurality of pairs of concavities on said carrier, lan air-inlet opening provided in said carrier for each pair of concavities provided thereon, an inlet-port in each con-v cavity communicating with one of said inletopenings, a plurality of parts of intermeshing toothed rolls rotatably mounted on said car rier in air-tight contact with said ooncavit-ies and with each other, one member of each pair of intermeshing rolls being in mesh with said rack, and means for rotating said carrier.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

LOUIS MARTAIN SARTAIN.

VWitnesses:

L. BARNES,

J. B. Hvrtns.V 

